AA 9909 then UA 2013 at Denver
Los Angeles → Denver → Seattle
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
15:53UA 2013 to Seattle leaves the gate
23 h 08 apart on the timetable, overnight
UA 2013 leaves 23 h 08 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.